manufacturing of copper crusher for measuring of chamber pressure

AR-15 & .223/5.56 Owners - Murray's Gunsmithing

The old way of measuring pressure was known as the copper crusher method. ... The SAAMI-spec pressure ceiling, the MAP allowed for the .223, is 55,000 PSI. ... use million-dollar labs to measure ammo for their ammo manufacturing bosses.

Open access - ORBi

It is widely known that the result of a chamber pressure measurement is ... supplied with the copper crushers, the results did not permit to make any statistically ... regard, several manufacturers developed different types of piezoelectric pressure.

Testing Firearms: Measuring Chamber Pressures - Firearms History ...

Jan 9, 2011 ... In this post, we will look into the technique of measuring pressures inside a ... whereas copper cylinders are used for higher pressure applications such ... method of choice for measuring chamber pressures, though crusher gauge .... world, because of their lower cost of manufacturing, lower tooling costs, .

proof - BASC

Table one gives the metric equivalent for the imperial chamber length. From 1984 to 1989, ... system to measure pressure, with bar as the unit of measurement. The two ... manufacturers to increase pressures to ... As the CIP minimum Copper Crusher Proof Pressure is 850 bar and High Performance (Magnum) 1200 bar, the.

W vm Limitations and Corrections in Measuring Dynamic ...

This work deals with limitations encountered in measuring the dynamic characteristics of .... Lest program during manufacture and assembly. ...... transducer using a spherical copper crusher deformed by an anvil face while in the chamber ... piezoelectric pressure transducer measuring propellent chamber pressure, signal is...

1 - Defense Technical Information Center

Today, copper crusher gauges have largely given way to quartz piezoelectric ... positioned at the chamber (to measure in-case pressure) and at the case mouth ... ammunition encompassing a number of different manufacturers and lot...

.308 Winchester vs. 7.62x51mm NATO

SAAMI specifies a maximum average pressure for .308 Winchester of 62,000 ... Winchester designed and provided initial manufacturing of the T-65 cartridge ... Piezo pressure measurements are much more accurate than copper crushers, and...

When are Pressures Too High? « Shooters Notes

The brass was Hornady and the expected pressures per QuickLoad® ran ... In brief, one measures the change in diameter of the case at the head ... to his calculation for the SAAMI maximum pressure for the .243 Winchester. ... This is not a location that produces behavior that is analogous to the copper crusher cylinder.

.38+P ammo is the same as pre 1972 ammo? - Smith & Wesson Forum

All that is needed is to look at the actual chamber pressure to see how mild .... Doug, the individual pressure figures are published by the manufacturers. ..... days the standard pressure measurement relied on crushing copper...

.308 Winchester and 7.62x51mm NATO: interchangeable calibers ...

Now let's say one of the manufacturing houses uses a very different protocol, and one ... Crusher and Piezo use two different measuring systems that have used the ... the pressure with Copper Crusher and SAAMI with piezoelectric sensors.

DIY Proof test ammunition for pistols. - Practical Machinist

Mar 12, 2012 ... You have to measure them. .... Some of the factors that affect chamber pressure (besides the ... Cartridges loaded to "Prove" Fiurearms are Specially loaded and calibrated using Pressure testing Devices ( Once Copper Crusher, now ... locking surfaces in case of any minor manufacturing irregularities.

Reloading w/ 5.56 cartridges - AR15.Com Archive

You can find actual pressure tested 5.56 data from Western .... specs and modified the bullet slightly to meet US manufacturing. When the US was still using the copper crusher method to measure chamber pressure, the M855...

Reloading 223/5.56 with H335 - Calguns.net

As it turns out my RCBS Little Dandy powder measure throws 23gr of ... I'd really like to see the major bullet and powder manufacturers publish data for 16" barrels with 5.56x45 chambers ... This keeps the chamber pressure well below max and is easy on the ... 52,000 cup (SAAMI copper crusher method)

Conformal Sensor Measures Ammunition Pressure Through Shell ...

The conformal sensor measures ammunition gun chamber pressure through an ... The copper crusher is a conventional ballistic test device that works by ... and production testing for measurement of ammunition and gun barrel pressures.

Wild West Firearms & Training | Gun Glossary - CCWMesquite.com

Used by ammunition manufacturers to measure uniformity of crimp. Bullet Puller. A tool for extracting bullets from ... Copper Crusher Small, solid copper cylinder used in a pressure gun to measure chamber pressure. See pressure gun. Cordite

Story of .338 Lapua Magnum - Lapua

Case got stuck into the chamber and the construction caused inappropriate feeding. ... This resulted in specifying the measurements, and the cartridge was named the .338 Lapua Magnum. ... The original pressure definition based on the deformation of the copper pellet method - the crusher method - was specified in the...

Calicoforum.com :: View topic - â€œGeneral information on +P, +P+ ...

Third, What are the current SAAMI pressure specifications for 9mm ammunition? ... slightly higher than copper crusher measurements as they more accurately ... However, most ammunition manufacturers tend to use the +p+...

The Miniature Internal Electronic Pressure Gauge and Dynamic ...

Copper Unit of Pressure (CUP) Defined by Hodgdon « Daily Bulletin

Apr 18, 2015 ... When the cartridge was fired, the amount of crushing measured on the ... more accurate measurements of chamber pressures in pounds per .... based on certain standards (SAAMI & CIP) as well as manufacturers tolerances.

Bullet Ballistics 101: Pressure, Velocity & Distance - Gun Digest

Sep 14, 2012 ... Measuring gas pressure proved as difficult at first as measuring bullet velocity. ... Copper crushers are generally either .146 in diameter and .400 long to ... flow of copper is slower than the change of pressure in the chamber.

CUP, psi & Reloading Data - Shooting Times

Jan 4, 2011 ... A copper crusher is placed on the upper end of the piston. ... We measure the crusher and consult a table of pressure values provided with each crusher lot. ... In Sporting Arms and Ammunition Manufacturers Institute (SAAMI)...

Internal Ballistics - FR. FROG'S Home Page

This designation is now used to signify a measurement of chamber pressure taken ... Piezo-electric units operate in a similar fashion to the copper crusher units but ... Other than for historical recreational shooting and the manufacture of some...

Chamber pressure - Wikipedia, the free encyclopedia

The Truth About 308 Win and 762 NATO.pdf - DocDroid

my measurements approached very close to 56.2 grains of water, and for ... be aware that only manufacturers that are members of SAAMI are bound by the .... No accurate conversion between copper crusher and true pressure exists, but...

When Did 357 SAAMI Pressure Change? - THR

After all, measuring chamber pressure is intended to predict a safe ... do with their publications of pressure guidelines in the manufacturing of ammunition. .... both copper crusher and piezo electric transducer pressure data for...

Loading data for 5.56 NATO [Archive] - The Firing Line Forums

Note the chamber pressure stated in post 6 for this thread, "52,000 psi" is the ... of stating the pressure measured by the old copper units of pressure system. .... the mid-90's, you find military copper crusher numbers reported as "psi" at ... Manufacturers load .223 Rem. to 55,000 psi, as established by SAAMI

The Rifleman's Journal: Primers - Small Rifle Primer Study

I don't claim any special expertise in primer design or manufacture; however, I have, over ..... our use of a strain gauge pressure measuring system (Oehler 43) rather than the SAAMI standard copper crusher or piezoelectric transducer method...